"The hard part here is putting in all the redundancy, all the reliability, all the systems you need to say, 'Look, this thing can't land on somebody's head while they're walking around their neighborhood,'" Bezos said.

Technology experts were skeptical such a service could be implemented so quickly, NBC News reported. A FAA status report released last month, meanwhile, called "the safe integration" of drones into the National Airspace System a "significant challenge."

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The fastest shipping method Amazon currently offers is one-day service, and the company says there is a demand for even faster delivery.